The World Builder Pack provides 2 double sided map panels (Summer River and Winter Plains). These maps have detailed art but have been left primarily open so they can be freely modified. This pack includes 48 double sided terrain tokens that allow you to modify the existing maps of the Core Set or create new ones. These components will be very useful in using the online map and scenario releases planned for after launch. The winter side maps will tile well with Stalingrad and Hill 331 while the summer maps will tile with Trois Ponts and Monastery. This set introduces unique structures that provide benefits to units inside as well as elevation features. -description from publisher's website